非我而当者,吾师也;是我而当者,吾友也;谄谀我者,吾贼也。
能正确指出我缺点的人,是我的好老师;能赞成又能鞭策我的人,是我的好朋友;谄媚又阿谀奉承我的人,是害我的贼寇。
Every person you meet knows an amazing lot about something you know virtually nothing about. Your job is to discover what it is, and it won’t be obvious.